Fire alarm



q 1940. .1. o. PROULX 2,215,838

FIRE ALARM Filed March 22, 1939 @sab/Z 0 P/v zz/x INVENTOR ATTORNEYS Patented Sept. 24, 1940 UNITED STATES PATENT OFFICE FIRE ALARM Joseph 0. Proulx, Warren, E. I.

Application March 22, 1939, Serial No. 263,549

1 Claim. (01. 200-442) My invention relates to fire alarms, and has the nut is threaded for the reception of a terminal among its objects and advantages the provision screw 56 electrically connected with a wire 58 exof an improved switch mechanism responsive to tending to the alarm 60. A wire 62 leads from the predetermined room temperatures or direct conalarm 69 back to the source of current 32. It will 6 tact with flame for setting the alarm in operathus be seen that wire 58 is in conducting relation. tion with the tube It] through the medium of the In the accompanying drawing: terminal screw 56, nut 48 and the screw 50. Figure 1 is a view illustrating the switch mech- In the event of abnormal room temperatures, anism partly in section in combination with the body 36 will soften to permit the contact point electric circuit; 38 to engage the tube [0. The circuit through 10 Figure 2 is a view taken from the position indithe signal 60 will then be closed as follows: from cated by line 22 of Figure 1; battery 32 to the wire 30, terminal screw 28, nut Figure 3 is a view taken from the position in- 26, spring conductor 24, contact 38, tube l0, screw dicated by line 33 of Figure 1; 50, nut 48, terminal screw 56, wire 58, signal 68 Figure 4 is a sectional view along the line 4-4 and back to the source of current through the of Figure 1; and medium of the wire 62.

Figure 5 is a sectional view along the line 55 Screw !8 is anchored in a body 64 of insulating of Figure 1. material, which body is secured in the opening In the embodiment selected to illustrate my 66 in the tube It. Upon the screw [8 I mount invention, I make use of an open-ended metallic a metallic washer 68 which constitutes a con- 20 tube It) which constitutes a conductor for electric tact element. One end of a chain 10 is secured current, within which tube I provide a core l2 at 12 to the tube [0 and the other end is secured of insulating material. Within the core I2 I emto a link 14 connected with one end of a combed a wire l4, one end of which is electrically conbustible link 16 having its other end connected nected with a screw l6 and the other end elecwith a link l8 attached to the hook 83 on the 25 trically connected with a screw l8. Screw l6 exarm 54. To the link M I attach a weight 82, tends through an insulated body 20 anchored in which weight is arranged to engage the contact the opening 22 in the conductor shell l0. Aspring washer 68 when the link 16 is impaired through contact 24 is mounted on the screw H5 in conbeing enveloped in flame. Engagement between ductive relation therewith, but is insulated from the weight 82 and the contact washer 68 closes 30 the tube In. A nut 26 has threaded relation with the circuit through the alarm 61!, notwithstandthe screw l6 for firmly anchoring the upper end ing spaced relation between the contact point 38 of the spring contact 24. I provide the nut 26 and the tube Ill as follows: from battery 32 to with a threaded opening for the reception of a wire 30, terminal screw 28, nut 26, screw l6, wire terminal screw 28 to whichI connect one end of a M, screw l8, contact washer 68, Weight 82., link 35 wire 30 leading to a source of current 32. I4, chain 10, tube It, screw 50, nut 43, terminal The lower end of the spring contact 224 is pro screw 56, wire 58, alarm 69 and back to the curvided with a socket 34 in which I press a body 36 rent 32. It will thus be seen that I have provided of insulating material having such properties as a switch mechanism which effectively closes the to fuse under abnormal room temperatures. A circuit through the alarm in case of abnormal 40 contact point 38 is carried by the spring contact room temperature or in cases where the switch 24 and is normally held in spaced relation with mechanismv is suddenly enveloped in flame. the contact tube [0 because of the body 36. Con- I provide the tube 1 l) with a bracket 82 through tact 38 includes an element 40 having a threaded the medium of which the switch unit may be shank 42 threaded into a nut 44 between which mounted to a support, which may comprise the 45 and the Spring Contact 24 I 111136113056 a p g wall 84. The bracket is fashioned for accommostrip 46. Strip 45 is slotted at 48 to slide relativedating screws 86 which may be threaded into the ly to the shank 42, so that the strip may be adl, J s d longitudinally of the Spring Contact for Without further elaboration, the foregoing will 0 Varying its y- Shank 4 DaSSeS through so fully illustrate my invention that others may, 50 an Opening in the Contact Strip 4 but is not by applying current knowledge, readily adapt the justable relatively to the Stripsame for use under various conditions of service.

To the tube it I attach a nut 48' through the I i medium of a screw Between the 111113 and alarm switch comprising a body of insulathe b n I interpose a Conducting arm d tive material, a conductor shell on said body, a 55 terminal carried by said shell but insulated therefrom, a contact carried by said shell but insulated therefrom, a conductor embedded in said body and electrically connected with said terminal and said contact, a weighted flexible conductor electrically connected with said shell, an arm anchored to said shell, and a fusible element connected with said arm and said weighted flexible conductor for holding the latter spaced from said contact, with said flexible weighted conductor so arranged as to fall into engagement with the contact when said fusible element is destroyed.

JOSEPH O. PROULX. 

